# IB Chemistry HL - 2025 - Key Concepts

In the IB Chemistry HL (Higher Level) 2025 Key Concepts section, you will find summary videos that will help you review the most important concepts and skills necessary for success. They are ideal for a quick refresher before tackling questions in the Revision Village Questionbank or Practice Exams sections of the website.

Structure 1

## Models of the Particulate Nature of Matter

The Nuclear Atom

13 minutes

Electron Configuration

11 minutes

The Mole

13 minutes

Mole Applications

16 minutes

Structure 2

## Models of Bonding & Structure

Ionic Bonding

14 minutes

Covalent Bonding

15 minutes

VSEPR & Molecular Polarity

13 minutes

Intermolecular Forces

11 minutes

Metallic Bonding

5 minutes

Structure 3

## Classification of Matter

Properties of Elements

18 minutes

The Periodic Table - Classification of Elements

15 minutes

Classification of Organic Compounds - Functional Groups

16 minutes

Classification of Organic Compounds - Nomenclature

15 minutes

Reactivity 1

## What Drives Chemical Reactions?

Enthalpy Changes

12 minutes

Reactivity 2

## How Much, How Fast & How Far?

The Amount of Chemical Change

17 minutes

Rate of Reaction

6 minutes

Collision Theory & Catalysts

8 minutes

Equilibrium

11 minutes

Le Chatelier's Principle

10 minutes

Reactivity 3

## Mechanisms of Chemical Change

Theories of Acids & Bases

11 minutes

Properties and Strengths of Acids & Bases

14 minutes

pH & pOH Calculations

8 minutes

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